Yesterday I figured out my problem with the task scheduler under Windows XP. Norton Anti-virus's NDETECT.EXE would run once or twice while I was active on the computer. If the computer's password protected screensaver was active, it would not run. It would fail with a: “0x80070569: Logon failure: the user has not been granted the requested logon type at this computer. Verify that the task's Run-as name and password are valid and try again.”  I would re-enter the userid and password and try again. It would work.

It finally clicked for me when I was checking the security log file. It was generating a 534 audit failure for logon type 4. Logon type 4 is a batch logon. A quick check of the GPO showed that my userid was not authorized to logon as a batch job. I was surprised since I was a member of the administrator group.

This should clean up my problems with the Quickbooks weekly backup and Norton Anti-Virus.